Optical image capturing module

Abstract

An optical image capturing module includes a lens assembly and a circuit assembly including a circuit substrate having a through hole and an image sensing component. A lower surface of the circuit substrate has multiple circuit contacts. A sensing surface of the image sensing component has multiple image contacts. Each image contact is electrically connected to one of the circuit contacts via a signal transmission element, thereby the sensing surface directly faces the through hole. The lens assembly includes a fixed base disposed on an upper surface of the circuit substrate, a movable base disposed in a focusing hole, and a lens group disposed in the movable base. The fixed base has the focusing hole penetrating through two ends thereof. The lens group includes at least two lenses having refractive power, thereby light could pass through the lens group and the through hole and project onto the image sensing component.

What is claimed is: 
     
       1. An optical image capturing module, comprising:
 a circuit assembly, which comprises a circuit substrate and an image sensing component, wherein the circuit substrate has an upper surface and a lower surface, which are located on opposite side, and has a through hole penetrating through the upper surface and the lower surface; the lower surface of the circuit substrate has a plurality of circuit contacts thereon; the image sensing component has a sensing surface, wherein a surface of the image sensing component has a plurality of image contacts on the same side with the sensing surface; each of the image contacts is electrically connected to one of the circuit contacts on the circuit substrate via a signal transmission element, so that the sensing surface directly faces the through hole; and 
 a lens assembly, which comprises a fixed base, a movable base, and a lens group, wherein the fixed base is made of an opaque material and has a focusing hole penetrating through two ends of the fixed base, so that the fixed base is hollow; in addition, the fixed base is disposed on the upper surface of the circuit substrate, so that the image sensing component directly faces the focusing hole via the through hole; the movable base is disposed in the fixed base and is located in the focusing hole to be located above the image sensing component, and is controllable to move relative to the fixed base in the focusing hole in a central axial direction of the focusing hole; the movable base has a receiving hole penetrating through two ends of the movable base, so that the movable base is hollow; the lens group comprises at least two lenses having refractive power, and is disposed on the movable base and is located in the receiving hole; moreover, an image plane of the lens group is adjustable to be located on the sensing surface along with a movement of the movable base, and an optical axis of the lens group overlaps with a central normal of the sensing surface, so that a light passes through the lens group in the receiving hole and the through hole, and projects onto the sensing surface; 
 wherein the optical image capturing module satisfies: 
 1.0≤f/HEP≤10.0; 
 0 deg<HAF≤150 deg; 
 0 mm<PhiD≤18 mm; 
 O<PhiA/PhiD≤0.99; and 
 0.9≤2(ARE/HEP)≤2.0; 
 where f is a focal length of the lens group; HEP is an entrance pupil diameter of the lens group; HAF is a half of a maximum field angle of the lens group; PhiD is a maximum value of a minimum length on a periphery of the fixed base perpendicular to the optical axis of the lens group; PhiA is a maximum effective diameter of an image-side surface of the at least two lenses of the lens group closest to the image plane; ARE is a profile curve length measured from a start point where the optical axis of the lens group passes through any surface of one of the at least two lenses, along a surface profile of the corresponding lens, and finally to a coordinate point of a perpendicular distance where is a half of the entrance pupil diameter away from the optical axis. 
 
     
     
       2. The optical image capturing module of  claim 1 , wherein the optical image capturing module further satisfies:
 0.9≤ARS/EHD≤2.0; 
 where for any surface of any lens, ARS is a profile curve length measured from a start point where the optical axis passes therethrough, along a surface profile thereof, and finally to an end point of the maximum effective half diameter thereof; EHD is a maximum effective half diameter thereof. 
 
     
     
       3. The optical image capturing module of  claim 1 , wherein the optical image capturing module further satisfies:
 PLTA≤100 μm; 
 PSTA≤100 μm; 
 NLTA≤100 μm; 
 NSTA≤100 μm; 
 SLTA≤100 μm; 
 SSTA≤100 μm; and 
 |TDT|<250% 
 where HOI is a maximum height for image formation perpendicular to the optical axis on the image plane; PLTA is a transverse aberration at 0.7 HOT in a positive direction of a tangential ray fan aberration after the longest operation wavelength passing through an edge of the entrance pupil; PSTA is a transverse aberration at 0.7 HOI in the positive direction of the tangential ray fan aberration after the shortest operation wavelength passing through the edge of the entrance pupil; NLTA is a transverse aberration at 0.7 HOI in a negative direction of the tangential ray fan aberration after the longest operation wavelength passing through the edge of the entrance pupil; NSTA is a transverse aberration at 0.7 HOT in the negative direction of the tangential ray fan aberration after the shortest operation wavelength passing through the edge of the entrance pupil; SLTA is a transverse aberration at 0.7 HOI of a sagittal ray fan aberration after the longest operation wavelength passing through the edge of the entrance pupil; SSTA is a transverse aberration at 0.7 HOI of the sagittal ray fan aberration after the shortest operation wavelength passing through the edge of the entrance pupil; TDT is a TV distortion for image formation in the optical image capturing module. 
 
     
     
       4. The optical image capturing module of  claim 1 , wherein the lens group comprises four lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, and a fourth lens in order along an optical axis from an object side to an image side; the lens group satisfies:
 0.1≤InTL/HOS≤0.95; 
 where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane; InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the fourth lens. 
 
     
     
       5. The optical image capturing module of  claim 1 , wherein the lens group comprises five lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order along an optical axis from an object side to an image side; the lens group satisfies:
 0.1≤InTL/HOS≤0.95: 
 where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane; InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the fifth lens. 
 
     
     
       6. The optical image capturing module of  claim 1 , wherein the lens group comprises six lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a six lens in order along an optical axis from an object side to an image side; the lens group satisfies:
 0.1≤InTL/HOS≤0.95; 
 where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane; InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the sixth lens. 
 
     
     
       7. The optical image capturing module of  claim 1 , wherein the lens group comprises seven lenses having refractive power, which are constituted by a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in order along an optical axis from an object side to an image side; the lens group satisfies:
 1≤InTL/HOS≤0.95; 
 where HOS is a distance in parallel with the optical axis between an object-side surface of the first lens and the image plane; InTL is a distance in parallel with the optical axis from the object-side surface of the first lens to an image-side surface of the seventh lens. 
 
     
     
       8. The optical image capturing module of  claim 1 , wherein the optical image capturing module further satisfies:
 MTFQ0≥0.2; 
 MTFQ3≥0.01; and 
 MTFQ7≥0.01; 
 where HOI is a maximum height for image formation perpendicular to the optical axis on the image plane; MTFQ0, MTFQ3, and MTFQ7 are respectively a value of modulation transfer function of visible light in a spatial frequency of 110 cycles/mm at the optical axis, 0.3 HOI, and 0.7 HOT on an image plane for visible light. 
 
     
     
       9. The optical image capturing module of  claim 1 , further comprising an aperture, wherein the optical image capturing module further satisfies:
 0.2≤InS/HOS≤1.1; 
 where InS is a distance on the optical axis between the aperture and the image plane; HOS is a distance in parallel with the optical axis between an object-side surface of one of the at least two lenses of the lens group furthest from the image plane and the image plane. 
 
     
     
       10. The optical image capturing module of  claim 1 , wherein the movable base further comprises a lens barrel and an inner holder; the inner holder is fixed in the fixed base and is located in the focusing hole, and is controllable to move relative to the fixed base; the inner holder has an inner through hole penetrating through two ends of the inner holder, so that the inner holder is hollow; the lens barrel is disposed in the inner holder and is located in the inner through hole, and is driven by the inner holder to move relative to the fixed base, and has the receiving hole penetrating through two ends of the lens barrel, so that the lens barrel is hollow; the lens group is disposed in the lens barrel to directly face the image sensing component. 
     
     
       11. The optical image capturing module of  claim 10 , wherein the optical image capturing module further satisfies:
 0 mm<TH1+TH2≤1.5 mm; 
 where TH1 is a distance from an outer wall of the fixed base to an inner wall of the inner through hole of the inner holder in a direction perpendicular to the optical axis of the lens group; TH2 is a thickness of the lens barrel. 
 
     
     
       12. The optical image capturing module of  claim 10 , wherein the optical image capturing module further satisfies:
 0<(TH1+TH2)/HOI≤0.95; 
 where TH1 is a distance from an outer wall of the fixed base to an inner wall of the inner through hole of the inner holder in a direction perpendicular to the optical axis of the lens group; TH2 is a thickness of the lens barrel; HOI is a maximum height for image formation perpendicular to the optical axis on the image plane. 
 
     
     
       13. The optical image capturing module of  claim 10 , wherein an outer peripheral wall of the lens barrel has an external thread thereon, and an inner wall of the inner through hole of the inner holder has an inner thread thereon, wherein the inner thread is screwed with the external thread, so that the lens barrel is disposed in the inner holder to be fixed in the inner through hole. 
     
     
       14. The optical image capturing module of  claim 10 , wherein a glue is coated between the lens barrel and the inner holder, and the lens barrel and the inner holder are fixed to each other via the glue, so that the lens barrel is disposed in the inner holder and is fixed in the inner through hole. 
     
     
       15. The optical image capturing module of  claim 1 , wherein the movable base is integrally formed as a monolithic unit. 
     
     
       16. The optical image capturing module of  claim 1 , wherein the optical image capturing module further comprises an IR-cut filter which is disposed in the circuit substrate and covers the through hole and is located in the receiving hole to be located above the image sensing component. 
     
     
       17. The optical image capturing module of  claim 1 , further comprising a bracket having a recess; a portion of the bracket around an opening of the recess is connected to the lower surface of the circuit substrate; the image sensing component is located in the recess. 
     
     
       18. The optical image capturing module of  claim 1 , wherein each of the signal transmission elements is a solder ball, a projection, a pin, or a group of their constituents. 
     
     
       19. The optical image capturing module of  claim 1 , wherein the optical image capturing module is applied to one of a group consisting of an electronic portable device, an electronic wearable device, an electronic monitoring device, an electronic information device, an electronic communication device, a machine vision device, and a vehicle electronic device.